There are currently no plans for an upgrade to wicket 1.5. The main reason simply is that too much has changed regarding resource handling. It looks as if a complete rewrite would be the best way to go but that’s just not feasible with my current lack of time. Additionally, we’re basically stuck with 1.4 as a migration seems far too much effort right now. But don’t get me wrong, it’s not a definitive no here, it’s just that there’s nothing planned.